What is IUPAC name of following compound?

What is IUPAC name of following compound?
  1. 5-Chloro-3-methylhept-4-ene
  2. 3-Chloro-5-methylhept-3-ene
  3. 3-Chloro-5-ethylhex-3-ene
  4. 4-Chloro-2-ethylhex-3-ene

Asked in: MHT CET 2021 (22 Sep Shift 1)

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